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typescriptnestjsclass-transformer

Transform attributes in request body

I have used @Transform decorator from class-transformer to sanitize specific fields in user input.

import { IsString } from "class-validator";
import { Transform } from "class-transformer";

export class SearchRequestDto {
  @Transform((data) => data.value && sanitizeRegex(data.value))
  @IsString()
  readonly term: string = '';
}

How can I create a new decorator to add this transformer to DTO more straight forward. Like this:

export class SearchRequestDto {
  @Regex()
  @IsString()
  readonly term: string = '';
}
Solution

  • You can create a Custom Decorator that looks like this:

    export const Regex = () => Transform((data) => data.value && sanitizeRegex(data.value))

    And then use it the way you wanted:

    export class SearchRequestDto {
  @Regex()
  @IsString()
  readonly term: string = '';
}